<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>翻转单词顺序</title>
</head>
<body>
  <script>
    function fn(s) {
      return s.trim().split(/\s+/).reverse().join(" ")
    }
    console.log(fn('the sky is blue'))
  </script>
</body>
</html>